I built MSI neo4 platinum computer several years ago and while on xp and now windows 7 randomly shuts off. I have upgraded the cooling fan, replaced the Power supply unit, opened the case, changed the RAM. All of this to no avail. The strange thing is that the computer can run for days without this occurring, or it may occur withing 20 minutes. Also the LED lights blink on the Antec case alternating and I can not restart the computer without unplugging the power cord from the computer and waiting until the lED lights on the case stop blinking or else the computer will not do anythng including restarting. Any clues as to the problem?